Yes in a real life situation I’d want to know why there’s dead people walking around. If asked in character I’d say, “Yea I’m curious what happened”. But OOC it doesn’t improve the RP for me, I think it’s only come up IC a few times in the 2 years I’ve played here.
Either way, we moved far off from group war rules.

I literally just mean I don’t need to know that the infection came from a secret facility made by the Russians, or that a random nuke exploded in the ocean, or the intricacies of Chernarussian politics. None of that helps me get in game and experience good RP.

Hard truth, most people don’t care about the overall lore of the server. That doesn’t mean they don’t like RP, or that they’re unwilling to progress stories though. Wars offer conflict and interesting scenarios, such as hostage situations and negotiations between hostile and neutral groups.
If people want to be involved in a war, for whatever amount of time, allow them to be. If they don’t, then they can negotiate IC and figure stuff out. And finally, if they’re in a war and the opposing side isn’t willing to stop, no matter what happens in RP, then the admins should be talked to so stuff can get settled, you don’t need a rule for that. Putting in a rigid system to solve a niche problem caused a lot of problems in this community in the past, it’d be unfortunate if that lesson wasn’t learned.

Alright let me put it this way, if 2 groups agree to something beforehand then sure. Forcing them to do something they don’t want to do will cause problems. Maybe some people just want to fight? If their RP is fine and they don’t break any rules idk why everyone’s upset.